linux-kernel - Re: [PATCH v3 11/11] dt-bindings: gpio: Add bindings for Cadence I3C gpio expander

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Message-ID: <20180326132150.31dda65f@bbrezillon>
Date:   Mon, 26 Mar 2018 13:21:50 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Kumar Gala <galak@...eaurora.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v3 11/11] dt-bindings: gpio: Add bindings for Cadence
 I3C gpio expander

Hi Geert,

On Mon, 26 Mar 2018 12:17:26 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Hi Boris,
> 
> On Fri, Mar 23, 2018 at 12:00 PM, Boris Brezillon
> <boris.brezillon@...tlin.com> wrote:
> > Document the Cadence I3C gpio expander bindings.
> >
> > Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>  
> 
> Thanks for your patch!
> 
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
> > @@ -0,0 +1,38 @@
> > +* Cadence I3C GPIO expander
> > +
> > +The Cadence I3C GPIO expander provides 8 GPIOs controllable over I3C.
> > +This GPIOs can be configured in output or input mode and if they are in input
> > +mode they can generate IBIs (In Band Interrupts).
> > +
> > +Required properties for GPIO node:
> > +- reg : 3 cells encoding the I3C static address (none in our case) and the I3C
> > +       Provisional ID. See Documentation/devicetree/bindings/i3c/i3c.txt for
> > +       more details.
> > +       Should be <0x0 0x392 0x0>.  
> 
> No compatible value?

See my other reply.

> 
> > +- gpio-controller : Marks the device node as a gpio controller.
> > +- #gpio-cells : Should be two. The first cell is the pin number and
> > +  the second cell is used to specify the gpio polarity:
> > +      0 = active high
> > +      1 = active low
> > +- interrupt-controller: Marks the device node as an interrupt controller.
> > +- #interrupt-cells : Should be 2.  The first cell is the GPIO number.
> > +  The second cell bits[3:0] is used to specify trigger type and level flags:
> > +      1 = low-to-high edge triggered.
> > +      2 = high-to-low edge triggered.
> > +      3 = triggered on both edges.
> > +      4 = active high level-sensitive.
> > +      8 = active low level-sensitive.
> > +
> > +Example:
> > +
> > +       i3c-master@xxx {
> > +               ...
> > +               i3c_gpio_expander: gpio@0,1c9,0 {  
> 
> gpio@0,392,0?

Actually, if I follow the DT bindings, it should be gpio@0,39200000000

Thanks,

Boris

-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com